Narrative:

While descending into ZZZ on the ZZZZZ2 STAR landing north; unknown to me; the first officer (PF) had gone to the prog page of the FMC and typed in zzzxxr on the update selection line on the left side of the screen and selected it. He then called my attention for verification and I looked across and saw zzzxxr on the right side of his FMC screen with an asterisk beside it. Although I do not normally put in the runway for a more accurate distance to the runway; it is commonly done by crew members that I work with. I am however not used to seeing an asterisk. Without knowing what typing had been done previously; I told him it was okay to select it. The FMC I believe then updated our position to zzzxxr and all required points for the arrival were lost. I informed ZZZ center that we had navigation degradation and requested vectors to ZZZ. We were given vectors and altitudes for the visual to runway xxr and landed without further issues.cause -1) it was the second leg of an a.m. Out and back. 2) the PF had not flown as PF for quite some time and actually had picked up this trip to retain currency. 3) the PF made changes in the FMC without first alerting me. 4) I incorrectly verified that is was okay to make the selection; not knowing what entries had been made previously. 5) the entry of zzzxxr should have been made on the line above where it was located with the asterisk. Suggestions -1) the pm should make all FMC entries when not in straight and level flight. 2) both crew members should be aware of all FMC changes. 3) the runway entry is to be over top of the destination entry only. 4) with my being unsure about the reason for the asterisk; I should have told the PF to abandon the idea of putting in data for runway distance and leave the page.

Google
 

Original NASA ASRS Text

Title: Air carrier flight crew reported an entry error while loading the STAR into the FMC/FMS.

Narrative: While descending into ZZZ on the ZZZZZ2 STAR Landing North; unknown to me; the First Officer (PF) had gone to the PROG page of the FMC and typed in ZZZXXR on the UPDATE Selection line on the left side of the screen and selected it. He then called my attention for verification and I looked across and saw ZZZXXR on the right side of his FMC screen with an asterisk beside it. Although I do not normally put in the runway for a more accurate distance to the runway; it is commonly done by crew members that I work with. I am however not used to seeing an asterisk. Without knowing what typing had been done previously; I told him it was okay to select it. The FMC I believe then updated our position to ZZZXXR and all required points for the arrival were lost. I informed ZZZ Center that we had navigation degradation and requested vectors to ZZZ. We were given vectors and altitudes for the visual to Runway XXR and landed without further issues.Cause -1) It was the second leg of an a.m. out and back. 2) The PF had not flown as PF for quite some time and actually had picked up this trip to retain currency. 3) The PF made changes in the FMC without first alerting me. 4) I incorrectly verified that is was okay to make the selection; not knowing what entries had been made previously. 5) The entry of ZZZXXR should have been made on the line above where it was located with the asterisk. Suggestions -1) The PM should make all FMC entries when not in straight and level flight. 2) Both crew members should be aware of all FMC changes. 3) The runway entry is to be over top of the destination entry only. 4) With my being unsure about the reason for the asterisk; I should have told the PF to abandon the idea of putting in data for runway distance and leave the page.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.